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#
# renames the file if it is different from its destination
include(CMakeParseArguments)
#
macro(replace_if_different SOURCE DST)
set(extra_macro_args ${ARGN})
set(options CREATE)
set(one_value_args)
set(multi_value_args)
cmake_parse_arguments(REPLACE_IF_DIFFERENT "${options}" "${one_value_args}" "${multi_value_args}" "${extra_macro_args}")
if (REPLACE_IF_DIFFERENT_CREATE AND (NOT (EXISTS "${DST}")))
file(WRITE "${DST}" "")
endif()
execute_process(COMMAND ${CMAKE_COMMAND} -E compare_files "${SOURCE}" "${DST}" RESULT_VARIABLE DIFFERENT)
if (DIFFERENT)
execute_process(COMMAND ${CMAKE_COMMAND} -E rename "${SOURCE}" "${DST}")
else()
execute_process(COMMAND ${CMAKE_COMMAND} -E remove "${SOURCE}")
endif()
endmacro()